Congenital myopathies in Israeli families

Area of Science:

• Neurology
• Genetics
• Pediatrics

Background:

• Congenital myopathies are a group of inherited neuromuscular disorders affecting muscle development.
• Understanding the clinical spectrum and genetic factors is crucial for diagnosis and management.

Purpose of the Study:

• To describe the clinical features of congenital myopathies in a cohort of Israeli patients.
• To analyze the prevalence of different congenital myopathy subtypes and their associated phenotypes.
• To identify factors correlating with disease severity, such as age of onset and specific subtypes.

Main Methods:

• Retrospective review of clinical data from 37 patients across 32 Israeli families diagnosed between 1983 and 2004.
• Classification of patients into specific congenital myopathy subtypes: congenital fiber type disproportion, myotubular myopathy, nemaline myopathy, central core disease, actin myopathy, and multi-minicore disease.
• Analysis of clinical presentation, age of onset, family history (consanguinity, recurrence), and phenotype severity.

Main Results:

• The cohort included 13 congenital fiber type disproportion, 10 myotubular myopathy, 7 nemaline myopathy, 5 central core disease, 1 actin myopathy, and 1 multi-minicore disease.
• 84% of patients presented symptoms before 4 months of age; 35% had a severe phenotype (ventilatory dependence or mortality before age 11).
• Myotubular myopathy (60%) and nemaline myopathy (57%) showed high rates of severe phenotypes, unlike congenital fiber type disproportion (23%) and central core disease (0%). Facial weakness was associated with severe outcomes.

Conclusions:

• Congenital myopathies exhibit diverse clinical presentations and varying severity across subtypes in the Israeli population.
• Myotubular and nemaline myopathies are associated with a higher likelihood of severe clinical outcomes.
• Early onset and facial weakness are indicators of potentially severe congenital myopathy.